A card cheat is threatened with exposure into joining a criminal enterprise that Sherlock Holmes believes is controlled by Professor Moriarity.
| Directing | Leslie S. Hiscott | Director |
| Art | James A. Carter | Art Direction |
| Sound | Baynham Honri | Sound Recordist |
| Camera | Sydney Blythe | Director of Photography |
| Production | Julius Hagen | Producer |
| Editing | Jack Harris | Editor |
| Writing | Arthur Conan Doyle | Story |
| Writing | Cyril Twyford | Screenplay |
